Method of producing alpha flat pictorial representation from alpha pattern in relief



Sept. 20, 1932. HERRMANN 1,878,138 METHOD OF PRODUCING A FLAT PICTORIAL REPRESENTATION FROM A PA TTERN IN RELIEF Filed Aug. 14, 1928 ZMM Patented Sept. 20, 1932 UNIT'- a s recs ERNST HERRMANN, 0E PFORZHEIM, GERMANY" nane METHdD 0E PRODUCING A ELAT PICTORIAL REPRESENTATION FROM A PATTERN IN RELIEF w 7' Application filed. August 14, 1928, Serial No. 299,571, andin Germany August 15, 1927.

either by hand or by a machine, the engraving tool of which, guided by means of a feeler sliding over a pattern in'relief,lifts out more or less deep indentations.

In all these cases relief-like pictorial representations are produced which, when produced by means of the engraving machine,

are generally in reduced scale, but otherwise exactly like the relief-pattern.

Owing to the comparatively great differences in depth shown by the plate with the pictorial representation, it is impossible to coat this plate with a layer of transparent ornamental enamel of uniform thickness designed to increase the natural brightness of the metal and to preserve the same. The enamel applied in the molten liquidstate flows from the higher points to the deeper points and settles in the same.

This inconvenience is avoided by the reproducing-method according to the. invention which has for its object to multiply or reproduce a relief-pattern in such a manner that the copy is not relief-like but absolutely plane like an engraving.

The plate carrying the flat reproduction can be covered without any dilficulty with a layer of enamel of uniform thickness, or it may be used like an engraved plate for copying by printing.

The pictorial representation made by the artist in high-relief can therefore be printed with the aid of the flat copy in catalogues, on deeds, banknotes or similar papers.

For jewelry-articles the most various materials, as precious and not precious metal, mother of pearl, glass, ivory, artificial corn, artificial resin and the like, may be used as carriers for the fiat reproduction.

.at the side of the other, in'accorda-nce with The new manufacturing method consists l in that the feeler which, controlled by a spring, is shiftably mounted at right angles to the pattern, is rigidly connectedto the plate mounted at right angles to the pattern as well as the same axial-movements the (7 feeler in accordance with the profiled Surface over whichthe feeler moves.

In the carrying out of the method the en gravin g tool cuts into the work-plate one line the transverse movement of the plate and the undulated lines, resulting fromthe unevennesses of the pattern in high-relief, produce on the work-plate shadings, which make the reproduction lookabsolutely like a reliefa representation,althoughit is quite plane.

The'carrying out of themethodis illustrated in the accompanying drawing in connection :with a long draw-guilloching ma chine.

relief. On the base-plate there is further mounted the support 9 for the tool-carrier h on which a rotary element is is mounted, carrying the holder for the engraving tool '5. The pattern-plate Z is cemented on a plate m, clamped in the pattern-slide f, and it can be shifted in the direction of the arrow-line B or in opposite direction by rotation'ofa spindle 'n.

. .ey Fig. 1 shows in elevation the tool and in V The work 0, for instance a rectangular plate, is fixed on a supporting plate 39 which is fixed on a slide 9, continually pressed by the action of a blade-spring 1" in the direction of the arrow-line D towards the relief-pattern 1 against which bears the feeler s. The movement of the tool If in the direction of the arrow-line E or in opposite direction is produced by rotation of a spindle u. To make it possible to adjust the tool t at the working on a curved work-plate always perpendicularly to said plate, the tool-holder i, pressed by the action of a spring in the direction of the arrow-line F, is mounted in a rotary element is oscillatably mounted in arc-shaped guides 41 of the tool-slide.

After each up and down movement of the slide a the pattern Z and the plate 0 are slightly displaced laterally so that at every stroke the feeler traverses a different line on the pattern parallel to the front line, and the tool will also trace a different line on the work dividing from the vertical by the displacement caused by the irregularities in the surface of the pattern This is repeated until the feeler has travelled over the whole pattern from one side to the other when the tool will have traced as many lines on the work plate as the strokes performed by the feeler on the pattern.

For-the transmission of the relief-pattern upon a plane or curved surface of the workplate 0 this plate carries out movements in front of the tool in the direction of the double arrow-line A. The tool 25 cuts ofi" thin chips and the feeler 8 slides over the pattern Z. The

pattern-plate Z as well as thetool t carry out each a slow lateral shifting movement after everyworking stroke, for instance in the direction of the arrow-lines B and D. The angular'value of the rotation of the spindles n and u necessary herefore is adjusted by means of graduated discs or graduated heads in such a manner that theflat reproduction of the whole relief-picture fits accurately into the surface designed for the same.

I claim A method of producing flat pictorial reproduction from a relief pattern, consisting in mounting the work plate on which the flat reproduction is to be made perpendicularly to the pattern plate in high relief, in rigidly connecting to said work plate a feeler bearing at right angles on said pattern, in repeatedly moving said feeler over the surface of said pattern so that when said feeler advances or recedes in following the contour of said relief pattern said work plate moves backwards and forwards at the same time and carries out lateral movements corresponding to the advancing and receding movements of the feeler on the surface of said pattern, and in shifting a cutting tool pressed at right angles against the work plate and the relief pattern a certain distance in lateral direction so that 

